Yuen, Simon Kin-chung; (1992) A study of the interactions of 200 A GeV 16O and 32S ions in nuclear emulsion. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

The general features of the hadronic inelastic interactions of 200 A GeV 16O and 32S ions with emulsion nuclei have been compared and contrasted. The fragmentation of 16O and 32S ions into projectile fragments of Z ≥ 2 has been investigated. The multiplicity distribution of slow, target associated particles and fast, shower particles and the correlations among various multiplicity parameters have been studied for varying degrees of projectile fragmentation. The results are consistent with a geometrical model. Rapidity analysis of a particular class of events, which exhibit complete projectile break-up without overt sign of low-energy target fragmentation, has been carried out. A systematic study of the electromagnetic dissociation(EMD) of 16O and 32S ions projectiles into exclusive channels of charged fragments at an incident energy of 200 A GeV has been carried out. The photoproduction cross-sections on 16O and 32S ions were determined by estimating the energy released in each interaction and assuming a model for the intensity and energy spectrum of the virtual photons. While there was good agreement for both 16O and 32S ions results for (γ, ρ) processes when compared with real photons data, especially in the giant dipole region, the rates for the (γ, α) processes were found to be an order of magnitude larger than expected. However, events, which have all the features ascribed to electromagnetic breakup plus a low-energy recoil proton, have been identified in interactions of 16O. An eikonal distorted-wave impulse approximation(DWIA) estimate of the target A-dependence of strong interaction diffractive dissociation, based on the hydrogen data, suggests that most of the (C α) final states might in fact be of hadronic origin. The mean free paths of fragments(Z=2-7) from the interaction of 16O at 200 A GeV at different distances from their production point have been investigated and were found to be the same, independent of their multiplicity, target size, production generation and production mechanism.

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